MICRF500BKQ-TR

MICRF500 Micrel MICRF500 700MHz to 1.1GHz RadioWire™ RF Transceiver Final General Description The MICRF500 is a single chip UHF transceiver designed for spread spectrum communication (FHSS) intended for ISM (Industrial, Scientific and Medical) and SRD (Short Range Device) frequency bands from 700MHz to 1100MHz with FSK data rates up to 128k baud. The transmitter consists of a PLL frequency synthesizer and a power amplifier. The frequency synthesizer consists of a voltage-controlled oscillator (VCO), a crystal oscillator, dualmodulus prescaler, programmable frequency dividers and a phase-detector. The loop filter is external for flexibility and can be a simple passive circuit. The VCO is a Colpitts oscillator which requires an external resonator and varactor. FSK modulation can be applied externally to the VCO. The synthesizer has two different N, M and A frequency dividers. FSK modulation can also be implemented by switching between these dividers (max. 2400bps). The lengths of the N and M and A registers are 12, 10 and 6 bits respectively. For all types of FSK modulation, data is entered at the DATAIXO pin (see application circuit). The output power of the power amplifier can be programmed to eight levels. A lock detect circuit detects when the PLL is in lock. In receive mode the PLL synthesizer generates the local oscillator (LO) signal. The N, M and A values that give the LO frequency are stored in the N0, M0 and A0 registers. The receiver is a zero intermediate frequency (IF) type in order to make channel filtering possible with low-power integrated low-pass filters. The receiver consists of a low-noise amplifier (LNA) that drives a quadrature mixer pair. The mixer outputs feed two identical signal channels in phase quadrature. Each channel includes a preamplifier, a third order Sallen-Key RC low pass filter that protects the following gyrator filter from strong adjacent channel signals and finally, a limiter. The main channel filter is a gyrator capacitor implementation of a seven-pole elliptic low pass filter. The elliptic filter minimizes the total capacitance required for a given selectivity and dynamic range. The cut-off frequency of the Sallen-Key RC filter can be programmed to four different frequencies: 10kHz, 30kHz, 60kHz and 200kHz. An external resistor adjusts the cut-off frequency of the gyrator filter. The demodulator demodulates the I and Q channel outputs and produces a digital data output. It detects the relative phase of the I and the Q channel signal. If the I channel signal lags the Q channel, the FSK tone frequency lies above the LO frequency (data ‘1’). If the I channel leads the Q channel, the FSK tone lies below the LO frequency (data ‘0’). The output of the receiver is available on the DATAIXO pin. A RSSI (Receive Signal Strength Indicator) circuit indicates the received signal level. RadioWire™ A two pin serial interface is used to program the circuit. External components are necessary for RF input and output impedance matching and decoupling of power. Other external components are the VCO resonator circuit with varactor, crystal, feedback capacitors and components for FSK modulation with the VCO, loop filter, bias resistors for the power amplifier and gyrator filters. A T/R switch can be implemented with 2-pin diodes. This gives maximum input sensitivity and transmit output power. Features • • • • • Frequency range: 700MHz to 1100MHz Modulation: FSK RF output power: 10dBm Sensitivity (19.2k bauds, BER=10-3): –104dBm Maximum data rate: 128k bauds Applications • • • • • • • Telemetry Remote metering Wireless controller Wireless data repeaters Remote control systems Wireless modem Wireless security system Ordering Information Part Number MICRF500BLQ Ambient Temp. Range Package –40°C to +85°C 44-Lead LQFP RadioWire is a trademark of Micrel, Inc. Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com March 2003 1 MICRF500 MICRF500 Micrel VB_IP QCHC ICHC IFQINN IFQINP MIXQOUTN MIXQOUTP IFIINN IFIINP MIXIOUTN MIXIOUTP Pin Configuration 1 2 3 4 5 6 7 8 9 10 11 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 12 13 14 15 16 17 18 19 20 21 22 MIXERVDD MIXERGND LNA_C RFGND2 RFIN RFVDD RFGND RFOUT PABIAS PA_C DIGGND XOSCIN XOSCOUT LD_C LOCKDET RSSI PDEXT DATAC DATAIXO CLKIN REGIN DIGVDD IFGND IFVDD ICHOUT QCHOUT OSCVDD OSCIN OSCGND GND CMPOUT CMPR MOD 44-Pin LQFP (BLQ) Pin Description Pin Number Pin Name 1 IFGND Pin Function IF Ground 2 IFVDD 3 ICHOUT I-Channel Output 4 QCHOUT Q-Channel Output 5 OSCVDD Colpitts Oscillator Power 6 OSCIN 7 OSCGND 8 GND 9 CMPOUT 10 CMPR Charge Pump Resistor Input 11 MOD Output for VCO Modulation 12 XOSCIN 13 XOSCOUT 14 LD_C 15 LOCKDET 16 RSSI 17 PDEXT Power Down Input (0=Power Down) 18 DATAC Data Filter Capacitor 19 DATAIXO 20 CLKIN Clock Input for Programming 21 REGIN Data Input for Programming 22 DIGVDD Digital Circuitry Power 23 DIGGND Digital Circuitry Ground MICRF500 IF Power Colpitts Oscillator Input Colpitts Oscillator and Substrate Ground Substrate Ground Charge Pump Output Crystal Oscillator Input Crystal Oscillator Output External Capacitor for Lock Detector Lock Detector Output Received Signal Strength Indicator Output Data Input/Output 2 March 2003 MICRF500 Micrel Pin Description, cont’t Pin Number Pin Name 24 PA_C 25 PABIAS External Bias Resistor for Power Amplifier 26 RFOUT Power Amplifier Output 27 RFGND LNA, PA and Substrate Ground 28 RFVDD LNA and PA Power 29 RFIN 30 RFGND2 31 LNA_C 32 MIXERGND Mixer Ground 33 MIXERVDD Mixer Power 34 MIXIOUTP I-Channel Mixer Positive Output 35 MIXIOUTN I-Channel Mixer Negative Output 36 IFIINP I-Channel IF Amplifier Positive Input 37 IFIINN I-Channel IF Amplifier Negative Input 38 MIXQOUTP Q-Channel Mixer Positive Output 39 MIXQOUTN Q-Channel Mixer Negative Output 40 IFQINP Q-Channel IF Amplifier Positive Input 41 IFQINN Q-Channel IF Amplifier Negative Input 42 ICHC I-Channel Amplifier Capacitor 43 QCHC Q-Channel Amplifier Capacitor 44 VB_IP Gyrator Filter Resistor March 2003 Pin Function Capacitor for Slow Ramp Up/Down of PA Low Noise RF Amplifier (LNA) Input LNA First Stage Ground External LNA Stabilizing Capacitor 3 MICRF500 MICRF500 Micrel Absolute Maximum Ratings (Note 1) Operating Ratings (Note 2) Maximum Supply Voltage (VDD) ................................... +7V Maximum NPN Reverse Base-Emitter Voltage .......... +2.5V Storage Temperature Range (TS) ............ –55°C to +150°C ESD Rating, Note 3 .................................................... 500V Supply Voltage (VIN) ................................... +2.5V to +3.4V Ambient Temperature (TA) ......................... –40°C to +85°C Package Thermal Resistance TQFP(θJA)-Multilayer board ............................. 46.3°C/W Electrical Characteristics FREF = 850MHz, VDD = 2.5 to 3.4V, TA = 25°C, unless otherwise specified. Parameter Condition Min Typ Max Units 700 850 1100 MHz